fix(workflow): simplify base_trades file detection

- Remove unnecessary negative lookahead
- Only match base_trades files in platforms directory

.github/workflows/dbt_run.yml

@@ -24,10 +24,10 @@ jobs:
         if: inputs.project == 'dex'
         run: |
           if [[ "${{ github.event_name }}" == "pull_request" ]]; then
-            git fetch origin ${{ github.base_ref }}
-            CHANGES=$(git diff --name-only origin/${{ github.base_ref }}..HEAD | grep -E "dbt_subprojects/${{ inputs.project }}/models/.*/platforms/(?!dex_).*_base_trades\.sql$" || true)
+            git fetch origin main
+            CHANGES=$(git diff --name-only origin/main..HEAD | grep -E "dbt_subprojects/${{ inputs.project }}/models/.*/platforms/.*_base_trades\.sql$" || true)
           else
-            CHANGES=$(git diff --name-only HEAD~1 | grep -E "dbt_subprojects/${{ inputs.project }}/models/.*/platforms/(?!dex_).*_base_trades\.sql$" || true)
+            CHANGES=$(git diff --name-only HEAD~1 | grep -E "dbt_subprojects/${{ inputs.project }}/models/.*/platforms/.*_base_trades\.sql$" || true)
           fi
           
           if [ ! -z "$CHANGES" ]; then